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Old 09-05-2013, 11:10 PM   #1
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Help with figuring out what size return pump i need.

So I have been slowly buying thing for my new salt water aquarium. I keep trying to do research on how to figure out what size return pump I will need. I will have a 75 gallon show tank and a 40 gallon breeder I will make into a sump. So you can figure 100 gallons give or tank couple gallons. Please help or point me in the right direction.
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Old 09-05-2013, 11:30 PM   #2
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How many gph or pipe size of overflow? I like mags so mag 7 will run wide opened,9.5 will have to be throttled back with a ball valve either one will benefit from a ball valve just incase it needs to be replaced.
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Old 09-05-2013, 11:38 PM   #3
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I think it's one inch but unsure I just order the tank tonight. It will be a marineland 75 gallon reef ready, with overflow in the Cornor.
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Old 09-05-2013, 11:53 PM   #4
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If it is a standard per drilled then they say 700gph with 1" bulkheads. You will want to have a pump rated just under that after headloss. There are headloss calculators online. As stated before a mag 7 or mag 9.5 with a ball valve will work depending on vertical distance from bottom of sump and top of display tank. Use headloss calc to figure out which.
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Old 09-07-2013, 06:46 PM   #5
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Trying to figure head loss will cause hair loss. Rule of thumb match the return to the over flow. Unless you have a long run or a lot of elbows it wont matter
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Old 09-07-2013, 07:15 PM   #6
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Regardless of the size you get I would recommend the ball valve so you can dial it in or as someone else said if you have to shut it down.
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Old 09-07-2013, 07:29 PM   #7
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Quote:
Originally Posted by Grizz View Post
Trying to figure head loss will cause hair loss. Rule of thumb match the return to the over flow. Unless you have a long run or a lot of elbows it wont matter
It's not that difficult. The calculator on reefcentral is super easy to use. Simply picking a pump that is rated to 700 gph just like overflow means you will end up with an undersized pump. A mag 7(700 gph) moving water just 3 feet vertically with no elbows looses 200 gph due to headloss. 3 feet isn't far. Use the calculators.

In the end go bigger with ball valve or bypass to dial down the gph to match overflow.
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Old 09-08-2013, 08:42 AM   #8
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Why choke a bigger pump? That's like buying a F1 and never driving it over 30 mph. The larger pumps cost more. The more parts you add to any system the more chances for failure Yes a Mag does lose 200 gph at 3ft But not every one is hung on those Mag pumps.
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Old 09-08-2013, 10:13 AM   #9
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I think I might go with a diablo Dc 3500 or 5500. It's a variable pump with a feed mode
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Old 09-08-2013, 10:21 AM   #10
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Nice pumps, cant go wrong with those.
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